2021 Lexus LX 570FACTORY OEM SERVICE PROCEDURE

Occupant Classification System

OCCUPANT CLASSIFICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC Code Detection Item Passenger Airbag ON/OFF Indicator (OFF Indicator) Proceed to
B1771 Passenger Side Buckle Switch Circuit Malfunction On Refer to DTC B1771: Passenger Side Buckle Switch Circuit Malfunction [09/2015 - ]
B1772 Seat Position Sensor Circuit Malfunction On Refer to DTC B1772: Seat Position Sensor Circuit Malfunction [09/2015 - ]
B1773 Belt Tension Sensor Circuit Malfunction On Refer to DTC B1773: Belt Tension Sensor Circuit Malfunction; DTC B1776: Seat Belt Tension Sensor Power Source Circuit Malfunction [09/2015 - ]
B1774 Pressure Sensor Circuit Malfunction On Refer to DTC B1774: Pressure Sensor Circuit Malfunction; DTC B1775: Pressure Sensor Power Source Circuit Malfunction [09/2015 - ]
B1775 Pressure Sensor Power Source Circuit Malfunction On Refer to DTC B1774: Pressure Sensor Circuit Malfunction; DTC B1775: Pressure Sensor Power Source Circuit Malfunction [09/2015 - ]
B1776 Seat Belt Tension Sensor Power Source Circuit Malfunction On Refer to DTC B1773: Belt Tension Sensor Circuit Malfunction; DTC B1776: Seat Belt Tension Sensor Power Source Circuit Malfunction [09/2015 - ]
B1790 Center Airbag Sensor Assembly Communication Circuit Malfunction On Refer to DTC B1790: Center Airbag Sensor Assembly Communication Circuit Malfunction [09/2015 - ]
B1795 Occupant Classification ECU Malfunction On Refer to DTC B1795: Occupant Classification ECU Malfunction [09/2015 - ]
B1797 Calibration Malfunction On Refer to DTC B1797: Calibration Malfunction [09/2015 - ]
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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